change css

## index.html
<!doctype html>
<html lang="en" ng-app>
<head>
	<meta charset="UTF-8">
	<title>test</title>
	<style>
		.menu-disabled-true {
			color: gray;
		}
	</style>
</head>
<body>
	<div ng-controller="DeathrayMenuController">
		<ul>
			<li class="menu-disabled-{{isDisabled}}" ng-click="stun()">Stun</li>
		</ul>
	</div>
	<script type="text/javascript" src="angular.min.js"></script>
	<script type="text/javascript" src="main.js"></script>
</body>
</html>

## index.js
function DeathrayMenuController($scope) {
	$scope.isDisabled = false;

	$scope.stun = function() {
		$scope.isDisabled = true;
	}
}
	<!doctype html>
	<html lang="en" ng-app>
	<head>
	<meta charset="UTF-8">
	<title>test</title>
	<style>
	.menu-disabled-true {
	color: gray;
	}
	</style>
	</head>
	<body>
	<div ng-controller="DeathrayMenuController">
	<ul>
	<li class="menu-disabled-{{isDisabled}}" ng-click="stun()">Stun</li>
	</ul>
	</div>
	<script type="text/javascript" src="angular.min.js"></script>
	<script type="text/javascript" src="main.js"></script>
	</body>
	</html>
	function DeathrayMenuController($scope) {
	$scope.isDisabled = false;

	$scope.stun = function() {
	$scope.isDisabled = true;
	}
	}